Precalculus Examples

$59 \frac{rev}{\min}$

Step 1

Use the fact that each revolution is $2 π$ radians and each minute is $60$ seconds to convert from $rpm$ to $\frac{radian}{sec}$

$\frac{59 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

Step 2

Cancel the common units.

$\frac{59 \cdot round}{min} \cdot \frac{2 π \cdot radian}{round} \cdot \frac{min}{60 \cdot sec}$

Step 3

Cancel the common factor of $2$ and $60$ .

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Step 3.1

Factor $2$ out of $59 \cdot (2 π)$ .

$\frac{2 (59 \cdot (π))}{60} \cdot \frac{radian}{sec}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor $2$ out of $60$ .

$\frac{2 (59 \cdot (π))}{2 \cdot 30} \cdot \frac{radian}{sec}$

Step 3.2.2

Cancel the common factor.

$\frac{2 (59 \cdot (π))}{2 \cdot 30} \cdot \frac{radian}{sec}$

Step 3.2.3

Rewrite the expression.

$\frac{59 \cdot (π)}{30} \cdot \frac{radian}{sec}$

$\frac{59 π}{30} \cdot \frac{radian}{sec}$

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